Thread-tension device for shuttles.



J. R. MITCHELL.

THREAD TENSION DEVICE FOR SHUTTLES.

APPLICATION FILED NOV. 21. 1915.

Patented June 20, 1916.

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THREAD-TENSION" DEVICE FOR SHUTTLES.

Application filed. November 2'7, 1915.

To all whom it may concern:

Be it known that I, JOHN R. MITCHELL, a citizen of the United States,residing at New York, county and State of New York, have inventedcertain new and useful Improvements in Thread-Tension Devices forShuttles, of which the following is a specification.

My invention relates to a thread tension device for shuttles, and, inparticular, it relates to an improvement in the construction of thedelivery eye or bushing shown and described in Patent No. 849,212, ofApril 2, 1907 to Daudelin.

The device shown in the above patent is made of solid metal throughoutso that portions thereof may be provided with exterior threads. Thefriction of the yarn or thread running through the eye of that device intime wears the device so that it must be replaced by a new one.

The principal object of my invention is to provide a device which willnot be subject to the wear of the thread and will therefore lastindefinitely. To that end I make the thread-engaging or guiding portionof the device of glazed porcelain which will provide a smooth guidingsurface, and cement a threaded metal head to the porcelain )art. 1 Theabove and other objects and the novel features of my invention will beapparent from the following description, taken in connection with thedrawing, in which,

Figure 1 is a side view of a bushing or guide embodying'my invention;Fig. 2 is a longitudinal sectional view of the guide through thelongitudinal slot therein; Fig. 3 is a perspective view of the guide,the parts being shown separated; Fig. 1 is a transverse sectional viewtaken on the line 1-4: of Fig. 2.

Referring to the drawing, the thread guide comprises two members whichare rigidly connected together, a porcelain body member 10 and a metalcap member 11. The porcelain body member 10 is substantially cylindricalin form having a substantially central cavity 12 extending into one endthereof and a reduced part 18 at the other end constituting a stem. Aslot 14 extends transversely of the body 10 inter mediate the ends ofthe latter at a point approximately at the bottom of the cavity 12. Saidslot 1 1 terminates in eyes 15 and 16 which are located on diametricallyopposite Specification of Letters Patent.

Patented June 20, 1916.

Serial No. 63,835.

sides of the body, the eye 16 forming the delivery eye of the device. Aslot 17 extends longitudinally of the body 10 from its outer end to theeye 15 to form a passageway through which the thread may be passed intothe slot 14 and eye 16. The thread runs through the cavity 12 and eye16. The outer edge 18 of the slot 17 is located nearer the center of thedevice than the opposite edge 19 so as to guide the thread into slot 17.The surface of the porcelain body including the parts over which thethread runs is glazed to provide a smooth surface to diminish friction.

The metal cap member 11 has a cavity 20 at one end adapted to receivethe stem 13 of the porcelain body 10 and said stem is firmly secured inthe cavity 20 by a suitable cementitious substance 21. The metal cap andporcelain body are therefore rigidly secured together as a unitarydevice. The exterior cylindrical surface of the cap is threaded as at 22to fit the corresponding threads in the opening in the shuttle in whichthe de vice is fastened. The outer end of the cap has a transverse slot23 to receive a screwdriver whereby the article may be turned in theshuttle to screw it into place. The exterior diameter ofthe metal cap isslightly greater than that of the porcelain part so that the latter maybe easily inserted in the shuttle.

It is to be understood that either of the two parts comprising thedevice may be pro vided with the socket and the other with the stem tofit the socket, and that the body member 10 may be of any suitablevitreous material. It will be seen that I have provided a device whichhas much better wearing properties than the device of the prior art,embodying as it does a porcelain or vitreous member which may beprovidedv with a glazed surface and a metal member which may be readilyprovided with threads to Secure the device to a shuttle.

Having thus described the invention, what is claimed and desired to besecured by Letters Patent is:

1. A new article of manufacture comprising a thread guide bushingconsisting of a glazed porcelain member having a threadguiding eye and athreaded metal head fixedly secured to said porcelain member.

2. A new article of manufacture comprising a glazed porcelain memberhaving a thread-delivery eye and a threaded metal head memberione (ifsaid members a slot at one end an d havi ng a socket stem fitting asocket in the other vmember, therein, said stem fitting said socket, and10 and cement in saidsocket rigidly and percement in'said socket rigidlyand permamanently uniting said members. a nently uniting said head andporcelain 5 3. A new article of manufacture compri'smember.

ing a glazed porcelain member having a In testimony WhereofI affix mysignature.

tl'i-read-d'elivery eye and a stem atone end thereof, a threaded 'metalhead provided 7 JOHN R. MITCHELL.

(Topics of this pat ent may be obtainedlorfive cents each, by addressingthe- "Gommiszioner otintents.

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